Those "climbing wall parameters' are undoubtedly vertical triggers.
You can learn more about those using Paolone's tutorial project on that subject: http://www.trlevelmanager.eu/demos.htm
Scroll down to the bottom to find the "vertical triggers" project.

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If it walks like a duck and if it quacks like a duck, it is a duck.

Hi, I'd like to "debug" my level because it crashes during the loading but I don't know why.
I've tried to delete and to move Lara in a square again, but nothing changes.
I don't know how to detect the bug...

You have provided too little information, nobody can tell you the exact cause if you don`t provide deeper information...

-does it crash before the title starts?
-does it crash before the level starts?
-does it crash when exiting level to title?
-does it crash at the beginning, at the midle or at the end of the loading bar?